TCP—多线程文件上传

最新推荐文章于 2023-09-21 23:21:37 发布

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最新推荐文章于 2023-09-21 23:21:37 发布

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CC 4.0 BY-SA版权

文章标签： tcp/ip java 网络

本文链接：https://blog.youkuaiyun.com/weixin_51992178/article/details/126119812

该博客展示了如何使用TCP协议在服务器和客户端之间实现安全的文件上传。服务端接收客户端通过TCP发送的JPG文件，并将其保存在指定目录下，确保文件的完整性和安全性。客户端则负责选择本地JPG文件并发送到服务器。整个过程涉及文件输入输出流的管理和异常处理。

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文件格式：JPG

说明：文件上传需要安全性和完整性，所以上传文件需要使用可靠的TCP协议传输

服务端类：

import java.io.*;
import java.net.Socket;

public class ServerThread implements Runnable{
    Socket socket;
    public ServerThread(Socket socket) {
        this.socket = socket;
    }
    @Override
    public void run() {
        //处理客户端需求
        int count=1;
        try {
            InputStream inputStream = socket.getInputStream();
            File parent = new File("D:\\Main7");
            if (!parent.exists()) {
                parent.mkdir();
            }
            File file = new File(parent, socket.getInetAddress().getHostName() +
                    "("+count + ").jpg");
            while (file.exists()) {
                file=new File(parent, socket.getInetAddress().getHostName() +
                        "("+(count++) + ").jpg");
            }
            FileOutputStream outputStream=new FileOutputStream(file);
            byte[] bytes = new byte[1024];
            int temp;
            while ((temp = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, temp);
            }
            socket.getOutputStream().write("上传成功".getBytes());
            inputStream.close();
            outputStream.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(socket.getInetAddress().getHostName()+"的文件保持成功");
    }
}

服务端启动类：

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class ServerStart {  //JPG格式文件上传
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8080);
            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("连接成功");
                new Thread(new ServerThread(socket)).start();
            }

        }

}

客户端：

import java.io.*;
import java.net.Socket;
import java.util.Scanner;

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("localhost", 8080);
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入文件名");
        FileInputStream fileInputStream = new FileInputStream("D:\\夸克网" +
                "盘下载\\2021-03_390P\\" + sc.nextLine());
        sc.close();
        OutputStream outputStream = socket.getOutputStream();
        byte[] bytes = new byte[1024];
        int temp;
        while ((temp = fileInputStream.read(bytes))!=-1) {
            outputStream.write(bytes, 0, temp);
        }
        outputStream.flush();
        fileInputStream.close();//读取完毕
        socket.shutdownOutput();
        BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(
                socket.getInputStream()
        ));
        System.out.println(bufferedReader.readLine());
        outputStream.close();
        bufferedReader.close();
        socket.close();
    }
}